Beautiful blue bridesmaid dress - evening gown

Gorgeous blue (Slate), open backed dress! Never worn! (Pictures are of other bridesmaids in the dress from the wedding I bought it for but could not attend.) Has a built in bra/pads already, pretty ruffle detail /sleeve that falls down the sides of the open back. Front is slit for easy movement, dancing, flirty detail. Color is technically called Slate, but looks like a grayish blue. It’s lighter in person than pics on the hanger. Maxi dress, long dress, evening gown